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Equity (Schedule of Share Repurchases) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Class of Stock [Line Items]      
Dollars $ 252 $ 427 $ 860
Class A [Member]      
Class of Stock [Line Items]      
Shares 3.7 5.9 13.5
Dollars $ 252 $ 427 $ 860
Share Repurchase Program [Member] | Class A [Member]      
Class of Stock [Line Items]      
Shares 2.3 4.9 12.5
Dollars $ 150 $ 350 $ 797
To fund certain obligations under equity compensation plans [Member] | Class A [Member]      
Class of Stock [Line Items]      
Shares 1.4 1.0 1.0
Dollars $ 102 $ 77 $ 63